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        Your present location:HomeIndustry News > The sealing and leakage of hydraulic system of heavy dump truck

        The sealing and leakage of hydraulic system of heavy dump truck

        Number of visits: Date:2015-08-04 16:24:30
        The sealing and leakage of hydraulic system of heavy dump truck
        Since the heavy truck pump, processing distribution valve, hydraulic cylinder and pipe sealing and leakage are as follows:
        1 oil pump shaft seal. Common heavy dump truck pump shaft neck installed two self tight seal, the outer end of the hole with a ring block, its role is to prevent the pump in the oil leakage and prevent outside air and dust from entering, once found here oil spill should be replaced immediately self tight seal. Installation, do not let the spline shaft seal. In addition, the speed is too high to cause the local temperature rise will make the oil seal metamorphism.
        2 seal between oil pump and transition plate. In the use of pump and valve body structure, the oil pump and the transition between the plate adopts the O-shaped seal ring seal, because here is fixed with hex bolts, sometimes because of stress, the looseness of the fastening bolt, and make this part of the oil, therefore, should be in the car maintenance attention to tighten the fastening bolts.
        3 oil spill damage. Oil pump noise increases, the pressure of the hydraulic system is insufficient or no pressure, pump discharge or no displacement and temperature is too high. Therefore, when the oil pump is found to be abnormal, should be immediately repair, serious damage should be replaced immediately, so as not to cause greater harm.
        4 oil pump, distribution valve between the leakage and sealing. In the use of the structure of the valve in the structure of the oil pump and the distribution valve between the sealing problem. Between the pump and the distribution valve uses a transition plate, sealing ring seal, bolted between them. Leakage occurs here, under normal circumstances, fastening bolts, leakage phenomenon can be eliminated. If there is still leakage phenomenon, should check the O-shaped seal ring is damaged, if damaged should be replaced in a timely manner; O-shaped seal ring such as normal should be inspection of the transition plate and the distribution valve with debris, and diesel cleaning two mating surfaces, and coated with anaerobic plane sealant, reassembled, can be completely removed the leakage phenomenon.
        5 distribution valve leakage and seal. Distribution valve leakage, mainly concentrated in the stem ends, internal leakage in the stem and the valve hole with the surface and a one-way valve cone, a one-way valve cone seal will affect the carriage stopped, and the valve stem leakage may lead to a decline in vehicle lift, the stem and the valve hole with precision to ensure that within a certain range, if the gap is too large, it may lead to increased leakage, reduce the total efficiency, lift down. At the same time, can also cause the stem ends of O-shaped seal ring wear, produce leakage.
        The replacement of O-shaped seal ring, be sure to pay attention not to let the stem and valve scratch O-shaped sealing ring, while paying attention to the O-shaped seal ring specifications do not use the wrong. Such as wrong, O-shaped sealing ring is too tight will cause increase operation force, causing the O-shaped sealing ring early wear and tear, leakage; O-shaped sealing ring too loose, will directly cause the leakage. In addition, should pay attention to the size of the hole and the positioning seat ring. So will cause the O-shaped seal ring undercut phenomenon, the O-shaped seal ring can not be used.
        6 hydraulic cylinder leakage and seal. Leakage and leakage are two main types of hydraulic cylinder leakage. For the single stage single action piston cylinder, the leakage location: between the cylinder and the cylinder head, piston rod and cylinder head, piston and cylinder. A flange at the upper end of the cylinder barrel, fixed with bolts on the cylinder head. They installed a O-shaped sealing ring, as long as several bolts on the flange force uniform here will not leak. Between the cylinder head and the piston rod is easy to leak, because the sealing ring is easy to wear and leakage, wear and the main reason is the piston rod surface roughness, hydraulic cylinder stop working more hours, sealing ring static friction resistance are higher, wear more serious. In addition, the number of hydraulic cylinder reciprocating, the piston movement speed is too fast, will increase the sealing ring wear, causing leakage. If the piston and cylinder barrel is installed with a poor coaxial degree, when the piston movement, there will appear the phenomenon of tilt and tilt leakage. For multi - stage single - acting cylinder, the main leakage part is: the leakage of cylinder. Because of the high pressure of the sealing part of the sleeve, the quality of the cylinder and the use of the condition of higher requirements, the long time coach of the unloading, the cylinder is loaded with force, easy to make the oil cylinder leakage.
        7 line. Self sealing truck hydraulic pipeline is mainly plane O-shaped seal structure. Including the seal between the high and low voltage socket and distribution valve, hydraulic cylinder between oil inlet seat and cylinder seal. Reason for such a seal failure is mainly loose nut, or with surface between beings impurities and O-shaped sealing ring curling, scratches and other conditions caused by. Through bolt tightening, cleaning and replacement, cooperate to solve the surface type seal way. For oil pump into and out of the tubing, you should regularly check the pipe joints and threaded joints if there is leakage phenomenon, found the problem, should be ready to tighten or replace parts. The manufacturers recommend removing hydraulic elements, the new type of sealing ring, the best replacement.

        TypeInfo: Industry News

        Keywords for the information:Heavy truck spill 

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